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unjammable

a. Not jammable.

Usage examples of "unjammable".

An arctic storm jammed the unjammable metering station at the pole: Hohbach, their chief of science, thought that a defective casing on the self-repair devices cracked and the equipment froze.

They were the untappable, unjammable, undetectable link which tied together angry men from Riga to Vladivostok.